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Old 02-18-2016, 10:36 AM   #1
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Truck Tire Pressure towing HT 26.5

We tow a 2011 Jayco Superlite HT 26.5 Fifth Wheel with a 2007 Toyota Tundra SR5 double cab 5.7 V8. We just purchased new truck tires Michelin LTX A/T2, 275 65/R18 tires load range E 10 ply tires. We can't get an answer from Michelin or Toyota on the correct tire pressure when towing. I'm thinking to inflate the maximum listed on the sidewall of the truck 80 psi in back and less in front. Anyone have thoughts on this?
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Old 02-18-2016, 10:44 AM   #2
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I always inflate tires to the maximum listed on the sidewall, this is how the tire is designed to run, helps keep heat to a minimum. I would never run the fronts lower than the rears, could cause handling problems.
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Old 02-18-2016, 10:45 AM   #3
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I always inflate tires to the maximum listed on the sidewall, this is how the tire is designed to run, helps keep heat to a minimum. I would never run the fronts lower than the rears, could cause handling problems.
This....
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Old 02-18-2016, 10:52 AM   #4
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I always use the pressures listed on the drivers door jamb sticker. Never failed me yet.

If you upgrade to a new lr and the old tires were at max, I would run the new ones at their max pressure.
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Old 02-18-2016, 10:58 AM   #5
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Originally Posted by Sundancer330 View Post
I always inflate tires to the maximum listed on the sidewall, this is how the tire is designed to run, helps keep heat to a minimum. I would never run the fronts lower than the rears, could cause handling problems.
X2 But I run the TV fronts 5 to 10psi lower. In my truck (diesel, 4wd, crew cab, long bed) the handling is better that way (less 'twitchy') and the ride a bit less harsh. YMMV.

Higher tire pressure means less side wall flexing. So in addition to lower heat, lower sidewall flex (like you get with higher load range tires) also helps reduce sway tendencies.
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Old 02-18-2016, 11:43 AM   #6
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My truck door placard stipulates the rears at 80 PSI (sidewall max) and fronts at 65 PSI. Rear carries more load, stands to reason they should be at max. No handling problems running them this way.

Michelin will have an inflation/load chart for your tire. The inflation will be based on the expected load to be carried by the tire.

That being said, I would run tires under large loads at max pressure, and less for tires under lighter loads (for increased comfort).
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Old 02-18-2016, 04:11 PM   #7
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My door placard also says the rear tires should be run at 80 and the front at 65. I have had no handling problems with this set-up, whether loaded or un-loaded.
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Old 02-18-2016, 04:26 PM   #8
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I inflate to what the tire manufacturer calls for on the side wall. I just got my truck serviced at my GMC dealer and, once again, they adjusted the tire pressure lower to what is on the door pillar. The service manager and I will have a serious discussion the next service!!
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Old 02-18-2016, 04:32 PM   #9
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It is a bit tricky running LTs on a 1500, but I would not tow without them...tire manufacturers should publish a load inflation table so you can calculate the correct pressure. I am relatively sure that if your truck was spec'd with P-rated tires, you should run a higher pressure when switching to LTs.

I found this document from Toyo super-useful:

http://www.toyotires.ca/sites/defaul...ationtable.pdf

see page 71, "P-Metric to LT-Metric". It gives an example with a F150 spec'd with P-rated tires at 35psi, for the same load capacity for an LT-metric it states you should inflate to 45psi. My dealer gave me the same number, you can option Silverado and Sierra 1500's with LT-rated tires and the door sticker says 45psi (from what they tell me).

Quote:
Originally Posted by mybrown29 View Post
We tow a 2011 Jayco Superlite HT 26.5 Fifth Wheel with a 2007 Toyota Tundra SR5 double cab 5.7 V8. We just purchased new truck tires Michelin LTX A/T2, 275 65/R18 tires load range E 10 ply tires. We can't get an answer from Michelin or Toyota on the correct tire pressure when towing. I'm thinking to inflate the maximum listed on the sidewall of the truck 80 psi in back and less in front. Anyone have thoughts on this?
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Old 02-18-2016, 04:41 PM   #10
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Originally Posted by dalengail View Post
I inflate to what the tire manufacturer calls for on the side wall. I just got my truck serviced at my GMC dealer and, once again, they adjusted the tire pressure lower to what is on the door pillar. The service manager and I will have a serious discussion the next service!!
If the tires on the truck match the sticker, the service dept is not wrong. Those stickers are based on the load the tire is carrying and should be figured using the aforementioned manufacturer's load/inflation chart. Technically, all tires should be inflated based on that chart. Many of us like to have our tires at the max sidewall pressure for various reasons, but like I said, this isn't technically right.

Now, if you asked the shop to inflate your tires to max sidewall pressure, and they didn't, that might be different. Or if you have different tires than the spec listed on the sticker in your door jamb, that would also be different. But for MOST users, the recommended pressure on the load/inflation sticker of the vehicle is perfectly adequate, and I think you would be challenged to find a shop that will arbitrarily inflate tires to the max sidewall pressure; they're always going to go with the manuf. suggested pressure.
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